Acquisitions (Schedule of the Allocation of Purchase Price of Indigo) (Details) - Indigo Natural Resources, LLC - USD ($) $ in Millions		3 Months Ended
	Sep. 01, 2021	Mar. 31, 2022
Consideration:
Total consideration	$ 1,961
Fair Value of Assets Acquired:
Cash and cash equivalents	55
Accounts receivable	192
Other current assets	2
Commodity derivative assets	2
Evaluated oil and gas properties	2,724
Unevaluated oil and gas properties (1)	693
Other property, plant and equipment	4
Other long-term assets	27
Total assets acquired	3,699
Fair Value of Liabilities Assumed:
Accounts payable (1)	283
Other current liabilities	55
Derivative liabilities	501
Revolving credit facility	95
Senior unsecured notes	726
Asset retirement obligations	8
Other noncurrent liabilities	70
Total liabilities assumed	1,738
Net Assets Acquired and Liabilities Assumed	$ 1,961
Purchase price adjustment		$ 9